Abstract:
:Apolipoprotein M (apoM) is a plasma apolipoprotein that mainly associates with high-density lipoproteins. Hence, most studies on apoM so far have investigated its effect on and association with lipid metabolism and atherosclerosis. The insight into apoM biology recently took a major turn. ApoM was identified as a carrier of the bioactive lipid sphingosine-1-phosphate (S1P). S1P activates five different G-protein-coupled receptors, known as the S1P-receptors 1-5 and, hence, affects a wide range of biological processes, such as lymphocyte trafficking, angiogenesis, wound repair and even virus suppression and cancer. The ability of apoM to bind S1P is due to a lipophilic binding pocket within the lipocalin structure of the apoM molecule. Mice overexpressing apoM have increased plasma S1P concentrations, whereas apoM-deficient mice have decreased S1P levels. ApoM-S1P is able to activate the S1P-receptor-1, affecting the function of endothelial cells, and apoM-deficient mice display impaired endothelial permeability in the lung. This review will focus on the putative biological roles of the new apoM-S1P axis in relation to lipoprotein metabolism, lipid disorders and atherosclerosis.
journal_name
Int J Mol Scijournal_title
International journal of molecular sciencesauthors
Arkensteijn BW,Berbée JF,Rensen PC,Nielsen LB,Christoffersen Cdoi
10.3390/ijms14034419subject
Has Abstractpub_date
2013-02-25 00:00:00pages
4419-31issue
3issn
1422-0067pii
ijms14034419journal_volume
14pub_type
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